How Should You Complete Form CT-1 X?

Use a Separate Form CT-1 X for Each Year You’re Correcting Use a separate Form CT-1 X for each Form CT-1 that you’re correcting. For example, if you found errors on your Forms CT-1 for 2023 and 2024, file one Form CT-1 X to correct the 2023 Form CT-1. File a second Form CT-1 X to correct the 2024 Form CT-1.

Employer Identification Number (EIN), RRB Number, Name, and Address Enter your EIN, RRB number, name, and address in the spaces provided. Also enter your name and EIN on the top of pages 2, 3, 4, and 5, and on any attachments. If your address has changed since you filed your Form CT-1, enter the corrected information and the IRS will update your address of record. Be sure to write your name, EIN, “Form CT-1 X,” and the calendar year you’re correcting on the top of any attachments.

Return You’re Correcting Enter the calendar year of the Form CT-1 you’re correcting in the box at the top of page 1. Enter the same calendar year on pages 2, 3, 4, and 5.

Enter the Date You Discovered Errors You must enter the date you discovered errors. You discover an error when you have enough information to be able to correct it. If you’re reporting several errors that you discovered at different times, enter the earliest date you discovered an error here. Report any subsequent dates and related errors on line 43.

Must You Make an Entry on Each Line? You must provide all of the information requested at the top of page 1 of Form CT-1 X. You must check one box (but not both) in Part 1. In Part 2, you must check the box on line 3 and any applicable boxes on lines 4 and 5. In Part 3, if any line doesn’t apply, leave it blank. Complete Parts 4 and 5 as instructed.

How Should You Report Negative Amounts? Form CT-1 X uses negative numbers to show reductions in tax (credits) and positive numbers to show additional tax (amounts you owe).

When reporting a negative amount in columns 3 and 4, use a minus sign instead of parentheses. For example, enter “-10.59” instead of “(10.59).” However, if you’re completing the return on your computer and your software only allows you to use parentheses to report negative amounts, you may use them.

If you receive a notice about a penalty after you file this return, reply to the notice with an explanation and we will determine if you meet reasonable-cause criteria. Don’t attach an explanation when you file your return.